Seal and means eor making the same



April 19 1927.

, 1,625,466 s. A. lHAMNETL SEAL AND MEANS FOR MAKING THE SAME Filed April 20, 1925 'EI gf.

ATTORNEY.

Patented pr. 19, 1927.

Unirsev stares,

sAi/IUEL A. Hannan, or Los miennes, caLironiviA.

SEAL AND MEANS FQR MAKING THE SAME,

. Application filed April 20, 1925. Serial No. 24,456.

Another ob'ectot' the invention is to ro-,

vide anI improved step in the method" of manufacturing seals.

Another object of the invention is to provide an improved heatingv device for heating parts of a seal to render one ot the dies plasticl An additional object ofthe invention-is to provide an improved die heating implement wherein a novel means is employed 'for controlling` the temperature of the implement.

Another object of the invention is to provide an improved contractile band for holding the parts of a seal in proper position while one of the diesis being formed'.

The above objects together with other objects ott-he invention will be apparent from the following. description Jca llzenin con nection with the accompanying drawings wherein Fig. 1 is a side elevation of a seal embodying the `features of my invention; Fig. 2'is` a top. plan view partly in section showing the relation of Athe/.various parts; Fig. 3 is an enlarged detail partly in sectionv showing the heatinginember' in place; Fig. 4 is a perspective View ot the contractile band.; Fig. 5 is a top plan viewy partly inv section showing a .modiied heating unit; Fig. 6 is a side elevation partly in section showing the modification and Fig. 7 is a perspective view of the bakelite disc. Y

Dreferring to the drawings by reference characteral haveshown the body of' a seal with which my invention is adapted to be used at 10. This sealrincludes a base 11 and an'operating. handle 12.l `The handle 12 operates an upper die 14 of brass or other material which may be secured in place by inserting a shank 15 thereon in a recess located in a plunger operated by the handle 12.

Opposite the die 14 is a base 16, the upper edge of' which is roughened as at 17 to provide a gripping surface for the lower die..

In manufacturing seals it is customary to irst construct the die 14 with the letters in relief,y thereon after which the other die member is placed beneath the die'14 and the 'companion letters are formed therein.

Heretofore the lower die has been constructed from a metal alloy which has not proved altogether satisfactory in use'. Attermuch experimenting, I find that material known to the trade as bakelite may be'used, and 'that the use of this material produces a highly superior article and at reduced cost.

Theproperties of bakelite are such that after being heated'andv allowed to set it is not ai'ected by reheating. Moreover it is not liable to become dentedeasily, thus prolonging the life of the seal andmoreover theseals are more easily manufactured' from bakelite. f

In using bakelite or other similar composition preferably provide a heating tool which is sh'own atI 20. This heating tool comprises an intermediate body portion 21 1' which is provided with cylindrical' heating elements 22 arranged at each side thereof. The heating elements 22 are connected through leads 23 andv 24 through a thermostatisticallycontrolled circuit closing device 26 with leads 27 and 28 which may 'be in communication with a source of electricity.

The ycircuit closing device 26 which is shown as arrangedbn the lead 11 comprises circuit closing members 30 and 31. The member 31 is mounted on a heat responsive element 32 which is preferably curved las shown and is' composed of the layers of metal having different coetlicients or eXpansion so that vwhen the member is heated or cooled its length is altered.

The element 32 is secured at one end in the base portion 21 of the tool so that this element will be aii'ected in accordance with the temperature of this base member.

In usingtheheating element it is placed with the base`21beneath the upper die 14. The handle 12xis then operated and` the heating element is held irmly between the base 16 and the upper die 14. W'hen these portions have been raised to the proper temperature the heating element is removed and a contractile band 30 which is shown in Fig. 4 is placed upon the base 16.

The band shown in Fig. 4 comprises a strip of thin ieXible metal having the ends thereof secured to brackets 35 and 36. The bracket 35 is provided with a pair of links lli' which pivotalliv connect a locking mem ber 35i which has a cam S9 on the end therc o l". The eonstriu'tion is .such that when the arm 3&5 is turned to the position shown in lf'igY Je the band will be held in retracted position.

After the band has been placed on the base 16 and before it is contracted a disc of baltelite is placed Within the band. The bakelite disc is preferably el the same size as the die let. The band is then tightened to engage the peripheijY ot" the die 11i and balrelite disc. The handle 12 is nest operated to bring the die hl upon the bakelite disc. This causes the balnli'le to soften due to the heated condition ot the parts hl and l0 so that the characters in the por tions .ll are impressed in the balzelite. After the parts have cooled the contractile band is removed and the seal is ready tor use.

In F ig. 5 l have shown a modiiied heating element wherein the base 50 is slotted as at 5l so that it may slide over the shank 52 (see Fig. 6) ot the seal 53. Heating elements 5d are arranged at each side of the base 50. A thermostat 55 similar to the thermostat 32 may control the circuit to the elements 54.

The seal here shown is provided with a base 56 which has apertures 57 therein adapted to be closed by plugs 5S. The upper portion of the base is serrated as at 59.

In using the device shown in Fig. 5 the heating element and the baliclite dise are both inserted "with a band 30 about the bakelite disc. The upper die 52 which is preferably made oi material such as brass, is then brought down upon the disc. Heat from the base 50 will pass to the die 52 and will heat the balielite as previouslj,T described.

The bakelite disc which is used is shown in Fig. 7 at G0. I preferably use a circular disc having planar upper and lower surl'aces as shown. The roughened surfaces 17 and 59 serve to hold the lower die in place. A thermostat .may be used to control the heating elements 54rit' desired.

Tit-h the use ot my invention seals mai7 be .made Without raising the temperature ot'V the bod)Y oi the die to a point Where the iinish ot the die would be otiected. `Furthermore, when the thermostatic control is used the heat applied may be completely Leeaeee controlled to secure ellicient operation.

Having thus describa-al my invention, l claim:

l. ln con'ibination with a seal liaving a base, means to hold a disc upon said base. said means comprising a flexible band adapted to engage said disc and means to alter the size oit said band and to hold the band in adjusted position.

2. In combination with a. seal having a base thereon, a disc on said base, means to render said disc plasticj a band for engaging the peripheryY ot said disc, said band having a pair oi' brackets thereon and means to urge said brackets together to tighten said band. said last mentioned means comprising a locking lever.

3. ln combination lwith a seal having a base, means to hold a dise upon said basev` said means comprising a contractile band adapted to engage said disc, said seal having a plunger thereon including a die, said band being normally larger than said die and means to reduce the diameter oit the contractile band.

t. In combination with a seal including a body portion having a base thereon and a plunger having a die thereon, means to actuate said plunger. said base portion having gripping portions thereon and having a disc thereon, said die being made ot plastic material such as a condensation product ot phenol and means movable with said plunger to heat the die and said base.

5. A seal comprising a body portion having a base thereon, a plunger having a die thereon, means to actuate said plunger, said base having gripping portions thereon and having a die thereon, said last mentioned die being made of material comprising a condensation product ot phenoh said mateu rial being embedded in the gripping por tions.

(i. lu combination with a seal incliuling a bod),v portion having a base thereon, a disc upon said base, said disc being constructed ot material plastic under heat, a die movable toward said base and having characters thereon, means to move said die and means movable with said die to heat said die, and a band surrounding said die and said disc.

ln testimony whereof, I hereunto aliix my signature.

o'llilllllfl L A.. ll A. M N ETT.

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